ISSUE-173: presentation semantics of control characters and other unmapped characters

presentation semantics of control characters and other unmapped characters

State:
CLOSED
Product:
TTML2
Raised by:
Glenn Adams
Opened on:
2012-08-08
Description:
it is unclear what the presentation semantics of control and other unmapped characters should be with respect to background color, default glyph, etc.; need to check if this is handled (indirectly) by XSL-FO semantics or not, and if not, then add some guidance and possibly normative text
Related Actions Items:
No related actions
Related emails:
  1. No Meeting today 12-09-13 (from Sean.Hayes@microsoft.com on 2013-09-12)
  2. Minutes for 05/09/13 (from nigel.megitt@bbc.co.uk on 2013-09-05)
  3. Agenda for 05/09/13 (from glenn@skynav.com on 2013-09-04)
  4. RE: TTML Agenda for 29/08/13 (from mdolan@newtbt.com on 2013-08-28)
  5. TTML Agenda for 29/08/13 (from glenn@skynav.com on 2013-08-28)
  6. Minutes - 2013-06-20 (from glenn@skynav.com on 2013-07-11)
  7. [minutes] Timed Text call June 20, 2013 (from plh@w3.org on 2013-06-27)
  8. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from tai@irt.de on 2013-06-19)
  9. TTML Agenda for 20/06/13 -- update -- (from Sean.Hayes@microsoft.com on 2013-06-19)
  10. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-19)
  11. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from tai@irt.de on 2013-06-19)
  12. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-18)
  13. Re: TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from glenn@skynav.com on 2013-06-18)
  14. TTML Agenda for 20/06/13 -- ADVANCE NOTICE -- (from Sean.Hayes@microsoft.com on 2013-06-17)
  15. TTWG Meeting Minutes Feb 7, 2013 (from momartin@microsoft.com on 2013-02-14)
  16. TTWG Meeting Minutes Feb 7, 2013 (from momartin@microsoft.com on 2013-02-07)
  17. TTML Agenda for 07/02/13 (from Sean.Hayes@microsoft.com on 2013-02-07)
  18. TTWG Meeting Minutes Jan 31, 2013 (from momartin@microsoft.com on 2013-02-06)
  19. TTML Agenda for 31/01/13 (from Sean.Hayes@microsoft.com on 2013-01-31)
  20. RE: TTML Agenda for 25/01/13 (from momartin@microsoft.com on 2013-01-24)
  21. TTML Agenda for 25/01/13 (from Sean.Hayes@microsoft.com on 2013-01-24)
  22. RE: TTML Agenda for 17/01/13 (from mdolan@newtbt.com on 2013-01-17)
  23. TTML Agenda for 17/01/13 (from Sean.Hayes@microsoft.com on 2013-01-17)
  24. TTWG Meeting Minutes Jan 10, 2013 (from momartin@microsoft.com on 2013-01-10)
  25. RE: TTML Agenda for 10/01/13 (from Sean.Hayes@microsoft.com on 2013-01-10)
  26. TTWG Minutes Dec 6, 2012 (from momartin@microsoft.com on 2012-12-12)
  27. TTWG Meeting Minutes Dec 6 (from momartin@microsoft.com on 2012-12-06)
  28. ISSUE-173: presentation semantics of control characters and other unmapped characters [DFXP 1.0] (from sysbot+tracker@w3.org on 2012-08-08)

Related notes:

TTWG Oct 25: http://www.w3.org/2012/10/25-tt-minutes.html. Discussion - TTML 1.0 needs clarification. Defer as TTML 1.1 issue.

Monica Martin, 30 Oct 2012, 19:37:57

TTWG Feb 14. Move to TTML v.next.

Monica Martin, 7 Feb 2013, 17:05:21

I believe this is indeed handled by XSL:FO. Essentially only the glyph areas created for characters designated as white space by XML (ie (#x20 | #x9 | #xD | #xA) get deleted when building line and glyph (see 4.7.2 Line-building part 6). Otherwise the glyph is taken from the nominal-font (which could be a system font) and will display the 'missing char' representation from that font if no explicit glyph is provided. (see section 5.5.7 Font Properties, Section 7.9.3 "font-selection-strategy")

Sean Hayes, 14 Jun 2013, 12:06:11

No action required. Semantics already covered by XSL-FO (and CSS).

Glenn Adams, 25 Aug 2013, 01:00:32

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David Singer <singer@apple.com>, Nigel Megitt <nigel.megitt@bbc.co.uk>, Chairs, Thierry Michel <tmichel@w3.org>, Philippe Le H├ęgaret <plh@w3.org>, Staff Contacts
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